libs: display: always call close_display()
libs: display: always call close_display()

All close_display() have their own checks for use_foreign_display and only
destroy locally created objects in that case.
Without this objects other than the actuall foreign display itself are
leaked.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/342>

ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi